Rendering all the pre-made data of a custom field at once on the screen in the backend can cause the post or page editor to look very confusing. Adding pagination to separate those values into pages, and also providing a search box to search any value right in the field will come in handy.
Although Gutenberg is the default editor in WordPress, not everyone wants to use it because of the bad editing experience. And Gutenberg loads CSS files and lots of inline styles on the front end, which will affect your website loading speed. This article will guide you on how to disable Gutenberg with a simple code without using plugins.